1247972658 has 16 divisors (see below), whose sum is σ = 2499126240. Its totient is φ = 415460736.

The previous prime is 1247972641. The next prime is 1247972659. The reversal of 1247972658 is 8562797421.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1247972658.

It is not an unprimeable number, because it can be changed into a prime (1247972659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127423 + ... + 136866.

It is an arithmetic number, because the mean of its divisors is an integer number (156195390).

Almost surely, 2^1247972658 is an apocalyptic number.

1247972658 is an abundant number, since it is smaller than the sum of its proper divisors (1251153582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1247972658 is a wasteful number, since it uses less digits than its factorization.

1247972658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265081.

The product of its digits is 1693440, while the sum is 51.

The square root of 1247972658 is about 35326.6564792084. The cubic root of 1247972658 is about 1076.6346597639.

The spelling of 1247972658 in words is "one billion, two hundred forty-seven million, nine hundred seventy-two thousand, six hundred fifty-eight".